help how to uninstal a font misdownloaded

Hi fellow mac users, the other day I downloaded a font from dafont.com ( by the way their fonts are wonderful), after I downloaded it it came up with a zip file like normal, when i unzipped it font book didnt ask me if I wanted to install it , rather it just came up with this file. when I try to dealeate it it says that the font is in use but, It doesnt show up in font book. (btw I run osx mountin lion.) thanks